From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gunter Ohrner Subject: cpufreq: powernow-k8 frequency transitions question Date: Sun, 01 Jan 2006 13:13:26 +0100 Message-ID: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@lists.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=m.gmane.org+glkc-cpufreq=m.gmane.org@lists.linux.org.uk Content-Type: text/plain; charset="iso-8859-1" To: cpufreq@lists.linux.org.uk Hi! I already asked this question on linux-kernel@vger.kernel.org but maybe this list would be a more appropriate place... I'm currently reading and playing with the powernow-k8 cpufreq driver module. However so far I wasn't able to find out how frequency transitions are dealt with that have to be made using intermediate steps, ie. transitions which cannot be done in one single step. (I read about this at=20 http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/260= 94.PDF p. 269f.) I found safety guards which return an error if an invalid frequency transition ("lo-lo transition") is requested. Is this the only support for these transitions currently implemented or did I miss something? Is there more advanced support simply missing, or is the current behaviour sufficient, and if yes, why does this suffice? How do the conservative/ondemand cpufreq governors cope with the kernel advertising frequencies it cannot directly transition between? I'd be really cool if someone could enlighten me, just some pointers at powernow-k8.c functions I should take a closer look at might already help. :-) Greetings, Gunter --=20 One of the universal rules of happiness is: always be wary of any=20 helpful item that weighs less than its operating manual. --=20 (Terry Pratchett, Jingo) *** PGP-Verschl=FCsselung bei eMails erw=FCnscht :-) *** PGP: 0x1128F25F ***